Butsuri
Online ISSN : 2423-8872
Print ISSN : 0029-0181
ISSN-L : 0029-0181
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Showing 1-22 articles out of 22 articles from the selected issue
Preface
Contents
Reviews
  • Shun Uchino
    Type: Reviews
    2021 Volume 76 Issue 1 Pages 4-12
    Published: January 05, 2021
    Released: January 05, 2021
    JOURNALS RESTRICTED ACCESS

    Ultracold atomic gases allow us to simulate bare essentials of complicated quantum phenomena, which are difficult to be resolved with other systems. Recently, so-called atomtronics devices to simulate mesoscopic transport with ultracold atomic gases have been realized in experiments. In this article, we review recent progress of two-terminal transport in ultracold atomic gases, with a special focus on point contact transport in two-component Fermi gases.

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Researches
  • Michihisa Takeuchi
    Type: Researches
    2021 Volume 76 Issue 1 Pages 13-16
    Published: January 05, 2021
    Released: January 05, 2021
    JOURNALS RESTRICTED ACCESS

    Experimental validation of the Standard Model of Particle Physics involves the measurement of the CP quantum number and couplings of the Higgs boson. Both ATLAS and CMS have reported an SM Higgs-like excess around mh=125 GeV. In this mass range the properties of the Higgs boson can be extracted from an analysis of the azimuthal angle distribution of the two jets in pphjj events. Instead of exploiting the jet angular correlation, we show that hadronic event shapes exhibit substantial discriminative power to separate a CP even from a CP odd Higgs. Some event shapes even show an increased sensitivity to the Higgs CP compared to the azimuthal angle correlation.

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  • Toru Kondo
    Type: Researches
    2021 Volume 76 Issue 1 Pages 17-22
    Published: January 05, 2021
    Released: January 05, 2021
    JOURNALS RESTRICTED ACCESS

    Natural environments surrounding organisms are constantly fluctuating. Biological systems achieve dynamic response functions for survival. This review shows advantages of the single-protein spectroscopy to investigate dynamic properties of chromoprotein. Fluorescence lifetime fluctuation analysis reveals a regulation mechanism of the photosynthetic light harvesting to respond to sunlight fluctuations.

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  • Takatsugu Masuda, Shohei Hayashida, Masashige Matsumoto
    Type: Researches
    2021 Volume 76 Issue 1 Pages 23-27
    Published: January 05, 2021
    Released: January 05, 2021
    JOURNALS RESTRICTED ACCESS

    We present neutron scattering under pressure in a triangular-lattice antiferromagnet that has a quantum disorder in the low-pressure phase and a noncollinear structure in the high-pressure phase. The neutron spectrum continuously evolves through critical pressure; a single mode in the disordered state becomes soft with the pressure and it splits into gapless and gapped modes in the ordered phase. Extended spin-wave theory reveals that the longitudinal and transverse fluctuations of spins are hybridized in the modes because of noncollinearity, and novel magnetic excitations are formed. We report a new hybridization of the phase and amplitude fluctuations of the order parameter near a quantum critical point in a spontaneously symmetry-broken state.

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  • Satoshi Yui, Hiromichi Kobayashi, Makoto Tsubota
    Type: Researches
    2021 Volume 76 Issue 1 Pages 28-33
    Published: January 05, 2021
    Released: January 05, 2021
    JOURNALS RESTRICTED ACCESS

    We show our recent studies on fully coupled two-fluid dynamics in superfluid 4He. In this system, the quantized vortices and the normal fluid affect each other through the mutual friction. The recent visualization experiments found strange phenomena. In the thermal counterflow, the velocity fluctuations of the laminar normal fluid is anisotropic. The fluctuations are more intense in the streamwise direction, as compared to transverse direction. The anisotropic fluctuations should be caused by the coupled dynamics of the two fluids. We performed the simulation and analyzed the velocity fluctuations of the normal fluid in the thermal counterflow. We found that the quantum turbulence causes the anisotropic velocity fluctuations. Our results are consistent with recent visualization experiments. This agreement validates the model of the coupled dynamics.

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